Improvement in millstone-staffs



P. SELLERS.

Mill-Stone Staff.

NO. l68,348 PatentedO( :t.5,1875.

WITNESSES INV N o MPEraRS, FHOTD-LIYHOGRAPHER, WASHINGTON, 0 C,

UNITED STATES PATENT OFFICE,

PETER SELLERS, OF LANCASTER COUNTY, PENNSYLVANIA.

IMPROVEMENT IN M ILLSTONE-STAFFS.

Specification forming part of Letters Patent No. 168,348, dated October5, 1875; application filed July 1,1875.

To all whom it may concern:

Be it known that I, PETER SELLERS, near Sporting Hill P. 0., in thecounty of Lancaster and State of Pennsylvania, have in vented certainImprovements in Red Marking for Millstone-Proof, of which the followingis a specification The object of this invention is to devise a means ormore certain method to indicate the highest and hardest points in a burror bed stone, in mills, to be peeked away, in order to obtain aperfectly-plane face. The ordinary socalled red-staff being found to betedious and unreliable unless complicated means are used in connectiontherewith, especially when there is a slight wind or twist, andinequality of hardness, as often happens. By this means all points aremarked at once over the whole surface by a slight rotary movement of themarking disk or slab.

This device is so simple that its operation will be at once understoodby a simple statement.

Figure 1 shows the annular disk of a circular form; Fig. 2, a sideelevation of its application to the bed-stone.

A slab, A, of marble, one to two inches thick, with one side madeperfectly flat-the other side may be slightly convexhas a central holeby which this circular disk is set over the spindle or bush in the eyeof the stone. It may be made a little larger in diameter than thebed-stone to be marked. The manner of using this disk A is first tocover its plane and level face with the ordinary red paint, mixed withwater. It is then let down over the spindle S until its painted facecomes in contact with the upper surface of the bed-stone. A slightrotary motion will be sufficient to indicate all the higher points atonce. -When these are dressed or cut away the operation can be repeateduntil the object is attained.

This disk can be provided with suitable handles, B, and will cost nomore when made out of marble, and even hooped with an iron band aroundits circumference, than steel-made redstaft's or proof-staff. The narrowor ordinary red-staff, so called, must be applied in various directions,and unless great pains are taken by means of counterparts and proofappliances, which consume time and make it tedious, the markings aremore or less unsatisfactory in many instances.

This simple marking-disk gives the most accurate result at once over theentire surface of the stone, and any novicecan apply it with equalefficacy. Simple and satisfactory as it has proved, I am not aware thatthis mode or marker was ever before used for the purpose.

I am aware that a millers staff composed of two straight edges rigidlyconnected to form a skeleton-frame, connected by a circle, and the wholebuilt of wood, so that a plane circular surface is formed into a diskhas been used. I therefore do not claim a circular wooden disk, nor onecomposed of separate pieces to form the inner surface, or filling up ofwood or other material, fitted in between a skeleton frame and ring.Therefore,

What I claim as my invention for marking the higher points on millstonesis-- The circular marble slab A, dressed out of a single piece, with itscentral opening 0 and handles D, as and for the purpose specified.

PETER SELLERS.

Witnesses:

J OHN M. AMW'EG, J AGOB STAUFFER.

